Appears to be a medium cage version of the SunTour XC Pro rear derailleur. Not sure if a longer (or shorter) cage version was produced as well. Produces with sealed bearing jockey pulleys standard.

Quality:

Rarity:

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SunTour derailleurs have a two-letter date code. On rear derailleurs the code is stamped on the back side of the inner parallel arm. On front derailleurs it is stamped on the back side of the inner cage.

The first letter represents the year. Larry Osborn and I believe O (Oh) is 1972, V is 1979 and A is 1984. As with Shimano, the second letter is the month code, where A is January and L is December.

SunTour Year Code

N

O

P

Q

R

S

T

U

V

W

X

Y

Z

1971

1972

1973

1974

1975

1976

1977

1978

1979

1980

1981

1982

1983

A

B

C

D

E

F

G

H

I

1984

1985

1986

1987

1988

1989

1990

1991

1992

SunTour Month Code

A

B

C

D

E

F

G

H

I

J

K

L

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

The earliest Suntour derailleur I have found with a code is marked OF. A rear derailleur marked OD (corresponding to April of 72) was reported by Leighton Walter. I have a bike that dates from between 1970 to 1972 that has the original SunTour derailleurs. These derailleurs do not have date codes on them, so I believe the coding started sometime between 1970 and April of 1972.

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